Laminated contact-brush.



C, AMBRUSTER.

LAMINAT ONTAGT BRUSH.

APPLICATIOL LED MAR. 7. 1912.

1,078,656. l Patented N0v.18,-1913.

CORNELIUS AMBRUSTER, OF ROSLYN, PENNSYLVAN.

LAMINATED CONTAC'll-BRUSH.

Specification of Letters Patent.

Patented Nov. 18,1913

Application filed March 7, 1912. lSerial No. 682,164.

; To all whom t 'may concern.'

Be it known that I, CORNELIUS AM- BRUsTEnfa citizen of the UnitedStates, and resident of Roslyn, in the county of Montgomery and State'of Pennsylvania, have invented certain new and useful Improvements inLaminated Contact-Brushes, of which `the following is a specification.

My invention relates to electrical apparatus in which a contact memberor brush consisting of a series of laminations isernployed'to makeelectrical contact with a Contact surface.

My invention consists of certain improvements in the arrangement of thelaminations and the angle of their contact surface, whereby a moreuniform contact pressure is obtained, as well as a better contactbetween' each lamination and the contact surface than has been possiblewith the arrangements heretofore used.

My invention will be more clearly understood. by reference to thefollowing description taken in connection with the accomnanyingdrawings,.in which Figure 1 is an elevation of a laminated brushembodying features of my invention, showing the parts when relieved ofcontact pressure, while Fig. 2 is an elevation of the same brush incontact with the contact surface, and subjected to normal contactpressure.

Referring to Fig. 1, L are the laminations of a contact brush, thethickness of these llaminations being somewhat exaggerated for the sakeof clearer illustration. Between adjacent laminat-ions are shown spacingpieces S, while on either side of'the laminations are shown pressureblocks P1 and P2 which serve to hold the laminations together in theirfixed relative positions. The entire combination of laminations, spacersand pressure blocks may be clamped or bolted together by any suitabledevice not shown in the drawing.

rlhe spacing pieces S all terminate at a uniform distance from thecontact edges of the laminations, so that the projecting ends of allthe'laminations which are. free to bend under pressure are of equallength, and, therefore, an equal amount of deflection produced bypressure will give a uniform pressure between the Contact edges of thelaminat-ions and the contact surface. i

The Contact edges of the several laininations arenished at an angle withtheir longitudinal surface more acute than that of the line 1-2 joiningthe tips of these laminations in Fig. l, so that when the brush is justbrought into Contact with the contact surface wit-hout the applicationof pressure only the tips of the laminat-ions will touch.

rEhe result oi applying pressure to the brush is shown in Fig. 2. itwill be seen that the application of this pressure bends. eachlamination by a uniform amount bringn ing the contact edge of eachlamination intofull Contact with the Contact surface A.

Having described my invention what it de sire to secure by LettersPatent is A contact brush consisting of laminations of which portionsproject and are free for deflection and have their ends beveled with thepoints and heels normally in two parallel planes respectively. A

ln testimony whereof l have hereunto signed my name.

CRNELIUS AMBRUSTER. Witnesses:

J. W. Amman, T. L. HAMMERSLEY.

